Installation & Operation Manual
44
7
Operating information
General
How the appliance operates
The Genesis uses a copper finned tube heat exchanger to
transfer heat from the flue products to the water. An electronic
controller initiates a call for heat and an ignition module
monitor controls blower and gas valve operation. The blower
provides both primary and secondary air to the burner and
forces the flue products out of the combustion chamber and
into the vent system. On models equipped with two speed
blowers, the controls change blower speed and firing stages,
based upon the heat demand. Gas valves regulate the amount
of gas supplied for the firing stages, which is mixed with the
combustion air supplied to the burner.
NOTICE
If an inline high gas pressure regulator is
used, it MUST BE of the lockup type and
be located a minimum of 10 feet from
the appliance. Failure to do so may result
in insufficient gas volume supplied to the
appliance.
NOTICE
If a pressure drop of more than 2" water
column occurs between Standby (static)
Mode and Operating (dynamic) Mode, a
gas volume problem exists. Contact the gas
utility, gas supplier, qualified installer, or
service agency to determine the necessary
steps to provide the proper gas volume to
the appliance.
How the control module operates
The electronic controller and ignition module receive inputs
from appliance sensors and external devices. The electronic
controller controls pump operation and regulates heat input
by activating the ignition module which controls the blower
and gas valve. The user programs the controller to meet system
needs by adjusting control parameters. These parameters set
operating temperatures and appliance operating modes. Water
heater operation can be based on a tank sensor or an external
sequencer device.
Protection features
Max Delta T – (factory default is off)
A maximum
T feature is provided. If enabled, this will allow
the controller to monitor the water heater’s
T to allow it to
display a Max
T error and enable the alarm circuit should the
programmed value be exceeded. The maximum
T can be set
to a value from 80°F to 20°F or OFF. If set to OFF it will disable
this feature. This can be useful to alert the user to either poor
flow or hard water issues. Factory default is OFF.
.
High limit operation – manual reset
When outlet temperature exceeds either 200°F or 210°F allowed
by local codes, a the high limit will trip. The appliance will shut
down until water cools down and the RESET button on the high
limit is pressed.
Monitor external limits
Connections are provided on the connection board for external
limits. The unit will shutdown and operation will be inhibited
whenever any of these limits open. Louver proving switch is one
example.
Optional Run-time and alarm outputs
If ordered, dry contacts for indicating appliance is running or
fault conditions exist with either the electronic controller or
ignition module that either require attention or are inhibiting
operation of the unit.
This feature does not eliminate the
possibility of freezing. The installer must
still use recognized design, installation and
maintenance practices to prevent freeze
potential of the appliance and system.
CAUTION
Freeze protection
The controller monitors the inlet and outlet sensor. If either
sensor drops below 45°F (7.2°C), the pump will turn on to
circulate water through the heat exchanger.
